InitLLVM.h

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//===- InitLLVM.h -----------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_SUPPORT_INITLLVM_H
#define LLVM_SUPPORT_INITLLVM_H
 
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/PrettyStackTrace.h"
#include <optional>
 
// The main() functions in typical LLVM tools start with InitLLVM which does
// the following one-time initializations:
//
//  1. Setting up a signal handler so that pretty stack trace is printed out
//     if a process crashes. A signal handler that exits when a failed write to
//     a pipe occurs may optionally be installed: this is on-by-default.
//
//  2. Set up the global new-handler which is called when a memory allocation
//     attempt fails.
//
//  3. If running on Windows, obtain command line arguments using a
//     multibyte character-aware API and convert arguments into UTF-8
//     encoding, so that you can assume that command line arguments are
//     always encoded in UTF-8 on any platform.
//
// InitLLVM calls llvm_shutdown() on destruction, which cleans up
// ManagedStatic objects.
namespace llvm {
class InitLLVM {
public:
  InitLLVM(int &Argc, const char **&Argv,
           bool InstallPipeSignalExitHandler = true);
  InitLLVM(int &Argc, char **&Argv, bool InstallPipeSignalExitHandler = true)
      : InitLLVM(Argc, const_cast<const char **&>(Argv),
                 InstallPipeSignalExitHandler) {}
 
  ~InitLLVM();
 
private:
  BumpPtrAllocator Alloc;
  SmallVector<const char *, 0> Args;
  std::optional<PrettyStackTraceProgram> StackPrinter;
};
} // namespace llvm
 
#endif